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From: "Luke-Jr" <luke@dashjr.org>
To: bitcoin-development@lists.sourceforge.net, Amir Taaki <zgenjix@yahoo.com>
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Subject: Re: [Bitcoin-development] BIP 16 changes (list inside)
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On Sunday, March 18, 2012 10:04:27 AM Amir Taaki wrote:
> Is this an accurate and precise summary of the changes needed for P2SH and
> BIP 16?

You might find my 0.4.x backport helpful:
    https://github.com/luke-jr/bitcoin/commit/bip16_0.4.x
Be aware, this still needs auditing (nobody else has looked it over), but I 
believe should cover only the minimal changes required to get P2SH validation 
(though not the "standard" rule changes to accept them into blocks).